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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37d736718de545e4cf4cd9e6450a2c319aacbbbbaa8dae45379e487bfcb88b1' 
  AND token = 'yWJ0+oLegO8nfaFQJROgRTP6nQWg5cV6MQlz3HMSqg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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