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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb02bd5b07041d94d2932bcaa028dba950fa12f5d34bd34f0a438cb26241240' 
  AND token = 'fCfoDDfK8SRtnhDkegGJ0ItPjvcuVQqG3eDVaA4gj3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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