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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688a32a8e1a31375ea70dc75c4272258580309e45bbb25b7e0aa4b32ed2e85e2' 
  AND token = 'MicVPSJ6OTjyngB+G8eJ/l2J7naI//Tu5ek/CX7bBmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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