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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1b10e85297a15ced89a1db9a5ad75e310c3a24ca84dd7f6028b0de4be36d31' 
  AND token = 'CQl8JAZwKGeWafb4iP1Ws6yBc1puJKdT1SAHwgsP5gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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