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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cf2f7e3adc3fefe368e937c93a598c2be0a9f53081f69f7e8c431cd83326a3' 
  AND token = '9b7Y3oos3VfxE6mRYnq0n2YSIwdPut1SvrqIZSkz1pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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