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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000cc881cbd21461be4c8d05a0bea92b1c1d21de662d1046869c795cead08681' 
  AND token = 'c9gYlduxxmk3gA1Fu6BRP7YhhYlE5rtpXqggIxkop4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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