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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf4ba2c14668fc67a29a8443de17800ea20f99b45cf2a399f9b7404604b93da' 
  AND token = 'YuzF+9nm7DyyBDhj49a1961jpH7imGBclOI4fwfStw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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