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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db91e9b83f2be17298ff5acb86511b51ccd5fddb4dab2df5a98271886eaf2b64' 
  AND token = 'nmgQNKYPh8C1b41SNekp8w6E2dq2P4mAa0gsK6xP5AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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