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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e5d79433b328e3f7a7db1d4dc0d47c698ee35c75be42e6f1e9991783d23bf5' 
  AND token = 'nU39MCp1nVvaMSYyAHwX6UP8qi2R1V+LVzAve7HnM3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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