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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd83c03112da41d35306479f36f91c451122bb1533c0863e855a4278946b34d1' 
  AND token = 'b6seA4snp6IcfBgNDFWlJFhvPJL2vTbiTfzGcTM1g5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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