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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a1de5f8ec1e1cc9cb551f89aa1d4956584a3922646983eafe0045dc22d9088' 
  AND token = 'w6AemGwPN1sSxsqgD/FzWJufq1EYOUNfTu1I+I7CRQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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