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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f20cad9d47ab879bc9d173627cac9a5774d0603a77bb03f36d92d72f00b69a' 
  AND token = 'PF9wx3IQbZWSWmg/sKPBtb7dj0bgRRWYgJwZRZUiNSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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