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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e7333386b60cbd7b7dc69ad327484ac3171c03515edc0051b00663fa527b14' 
  AND token = 'eB5nwI6NDoePka5CI9zFwerA0zNjNljXHOsVXRRMDNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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