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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2056c3969927b65fa880970570b57255e44db52e17fc77784969f4e8e12acbb' 
  AND token = 'ZmU7qNCeUYUMLHH0nSeiuX6TF5j1HYUZ0bRkrrJBOPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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