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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07e4633d0eae6947c469d125cd4b20bce41d44788429d612bc319eed11c28e5' 
  AND token = 'ijt4DMFa8TZYHQt3Hn3TEAATiNExUVeGymfpkB2uGco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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