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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94eaed66c6a0a0f15465b7fd8e112288f92272c7d1ae12d55c191a6d2c56c1f' 
  AND token = '8g6aT4qmtLlJqkzvepg0Tsa5TKZUWJWqlW0+Hcr9Syg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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