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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e3ade0672f990a4c73c66fbe1088ab563c9005b3a8626b38c25208eb2d2a70' 
  AND token = '6iAPOdbdjtCCo6HkBYp5eHhZNAiq+1uNdpUN0baaCdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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