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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55578a5adc0e21a88131666f16fad91fbd368d12d48f27eae9a9893b0e60cb2d' 
  AND token = '47vrgIpk8BSnNEuOapJ9NwzrSVsIb+iP3qnSHgVH7GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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