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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5001029282bdd62f335cca0dde69f227e83146a8523f9c1846b959aa4989b442' 
  AND token = 'dykVUxeduYW5KHd/ITp21NTMJROFDTzyHj9u6/XemTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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