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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7a1c4b4e92f65d54759b6311a642103422477dfefc1fa6bd2c6ddb4c3ca089' 
  AND token = 'fHXvjFs1ymseMkD6xhZQ69bFq7VfT2f7S8TBEjUkgec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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