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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db92d14c7d105a579a12cc42fbbfab8981c7e4eff588b9b63eeff8843acbf397' 
  AND token = 'tlScT1uwL/6o5UBZYQ+Ao+C5rObYUyCj2ukSBQ0Dilw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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