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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9032520d2f6a0caa8e84ef500427dbfda71f1b4e0908da2de1535a5d5cf10d' 
  AND token = '/MXU3xw1bauyVEHGWdE5p1g6qKyVt9xdgVPGWhWLnf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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