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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a036eb0fd1e757a1ee909aa2703f53032a81888f0f50cc4b0c2405ea5fe314' 
  AND token = 'dQIcZaEuX2dyqPS+ZxSLZE4sKGJQ4yEFVRyhwnv80w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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