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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd826d20cb996fe6580add03df193e5ef227a4df62b7167bdc66d631e3b86cfe5' 
  AND token = 't9wNrT0ukjXnEOi9OWvs0KW2iQp0C0M2btw/Oat17FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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