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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05a0535f0945aa6c89076e599470e0636a8c71e70626e9019b76ab58014e487' 
  AND token = 'J4Bw7gapXS8ppiALulbynToEy9DYMNlbH3CMTQkBpQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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