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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25562ab29d264eff71757389810bf840e345bfc1543106d9a356e18e05ebae6a' 
  AND token = 'KgMi1AXgihSiYvIDxAZbF25aBpxn0MGW3NFOUxDUIyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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