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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834fdeadbe77d4f5125d5d45c0f2d61eff24b7d29a51facf5106d86a46351d44' 
  AND token = '1cQAmJVDNXMWx0mMXscOJ0PRQZZCMbt3paeOQYuMhwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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