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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ad17f5b928899f110d840a2fba21cfabfee95e7d3a08df4ea475ddbad4564d' 
  AND token = '0O8KqBJ8bzrIjnJgerZYoo6b7cjCViHc9dXXYPb7/h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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