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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c373f04c355a78badee28fd8e9338b238e56be9688d870cff145f11216a9e39f' 
  AND token = 'RDGr/v/T6ODLYelOTUyLgIgQv7i5AcScRr1thSqVrn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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