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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2920d437348c2bdb86f49b13f57e13a8bf8770e8639f84c09936c31043f82523' 
  AND token = '9MjWgN2yUfr0DdYBQKilX1TBfximl9oC7zd3gRv0Nq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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