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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e4893a72a9e242c5eac98e11f680dd5e0e533d8409328ab7a76771f85b5f0c' 
  AND token = 'X+nY292IENFk4YAxLFYfmxbJqLlzx1YMMpX9NhJRZrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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