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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a21e58f828a357ceeb1f22bfd94062514c6c0aefe68d6bbe9d4ed9c54a70d8' 
  AND token = 'Y+bRmmZzKCYVHrOlF/eralOowugEYGAOHYpfIhu4bdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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