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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c935d7a6b575b41817b8cacfbd3169d6801e3e9f3db940f646db38003e44fe3' 
  AND token = 'O/9osZWjJbp1ftmHN6NQowFHfoMEfXNEwBVnLFpLQi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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