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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea5fdceff697542fcd259a5446de6c63bfa075b1fe0e0277fc50e1e01882200' 
  AND token = 'UB4/N7HyvxmmoXlBYnbLfvI4GbCg1n4/iTSs5+RKZ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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