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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c13a0b0b24f2ed2eec1b1a6b8ed308301df4a774a643880451971ec3a840cd0' 
  AND token = 'dSdZZ/OwHOrFiE9MUqR837i8Lu1M9TlkLHRaU8XZiAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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