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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9380ce196fa5f6139d25340e6447edf99e73e885236979608400e7e92f6646a2' 
  AND token = 'mIFondnKmNFYzDeyRS7GpSyZaYe3D/aL0TCE545gPg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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