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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b008ff0e35348f91040ede5dd5ad1011df073972eca9e7c1b542abfdbe21efb' 
  AND token = 'bomAKBYSbWUBdJTYHpeX/z3gWvsAM2g83akCN+JU/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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