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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7999b9d80ce2083186004c78a9725f1b1b7ac185afa66b9ca90738b6d654a535' 
  AND token = 'y2dStn2C0qk/P8TIAdulAvPXrV2j6VhWdnV2ClQc27A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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