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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972f0776508166c5780cc849d5762957dd78afb2b02502ab38d2d87c14c66892' 
  AND token = 'R1+r3qbPcHJzalW4e+2RYOOO0GnNVtkFzU3R24QgQqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}