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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b87013099ee5717b76e51eea534b01c2a2f886edc531b5d3c70bb2fbb5ed96b' 
  AND token = 'Er2icEmNxz76rQpXmJ9/Yx+nSKzbGN+0i+a4mZRFp3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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