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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcd1c6512502b5e68c862a302847b8f59361042f928c253c6f7e3e3e8e054e3' 
  AND token = 'c44ujvdU+XJCG1tJcH5ZkOGJE1hL8yVMsuOFqCTNpFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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