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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6869c43d2648c417ef5a1a7e530e18d1d28e59ecbfd4ee7f7aebea08cc5a93be' 
  AND token = 'rqltcxajX4ZPFavjc9vS3jyAThQvbZQu787GEztTCFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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