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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f7d7965ec096547d3c77a0e82b99558f98a54205f524df0fd5065b29cd9b53' 
  AND token = '4jXq8Akfshye5+GvGeXc2bWgyzWk6dxyRGKcdvqU7lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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