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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28b47235a3156b270e6c8ec91547b3b1a8e73a5fe26143343a1662a0e99ff19' 
  AND token = 'edIFDS9D77h0yFbuQEjOCuuOl+p2QTlpGbcko9S7w4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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