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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f59d5b0fd03dbc1c8c5e7ded39d16a708a0743c09d5b86f70727c245ef7b76' 
  AND token = 'dhEgbXLAfve5/GL5eC6CY88SFlZg9e+QhL5mgVJbitk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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