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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6de8e606cc09d310ab20f8f759ca0d83a2d2c64a486f5f59ec8d9bab27dadff' 
  AND token = 'h9krpyVyMt1te4fVYTpRLdl9bX1nGzjxjtDjMo3nge4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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