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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37292315ad8d5f734c945d9f7ce83f1da4e4d16a3fe7f2700ad6195ccbd6bedb' 
  AND token = 'V1PGkov/N0rHAB3ta0JPsxGZl3EzwWrp2CHtQWnSxok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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