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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7f6048420367e1ed636d3c9ca0b1d728e9368ca2949e291223655c1a4f6318' 
  AND token = 'OpUk15pV/qliTM/V793+ZfKFjR60k/oQTHrJoFReg6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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